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What is shingles?

Shingles, also known as herpes zoster, is a painful skin rash caused by the reactivation of the chickenpox virus (varicella-zoster virus) in people who have previously had chickenpox.

It begins with a burning sensation in the skin, followed by a rash of very painful fluid-filled blisters that can then burst and turn into sores before healing. Often an area on just one side of the body is affected, usually the chest but sometimes the head, face and eye.